[Xen-changelog] [linux-2.6.18-xen] xen: Set blocking timeout to 1/2 jiffy later than we want. This avoids

["Xen patchbot-linux-2.6.18-xen" <patchbot-linux-2.6.18-xen@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1212170930 -3600
# Node ID 557a4a0a5eacb83ffb2808c66fd9674e8e26f3e0
# Parent  936f6dd9d49c71c95931c9d8bdf4393cdb9fb42f
xen: Set blocking timeout to 1/2 jiffy later than we want. This avoids
repeated early wakeup just before the jiffy tick, causing us to
effectively spin rather than sleep.

Signed-off-by: Keir Fraser <keir.fraser@xxxxxxxxxx>
---
 arch/i386/kernel/time-xen.c |    2 +-
 1 files changed, 1 insertion(+), 1 deletion(-)

diff -r 936f6dd9d49c -r 557a4a0a5eac arch/i386/kernel/time-xen.c
--- a/arch/i386/kernel/time-xen.c       Tue May 27 10:33:54 2008 +0100
+++ b/arch/i386/kernel/time-xen.c       Fri May 30 19:08:50 2008 +0100
@@ -1013,7 +1013,7 @@ static void stop_hz_timer(void)
                j = jiffies + 1;
        }
 
-       singleshot.timeout_abs_ns = jiffies_to_st(j);
+       singleshot.timeout_abs_ns = jiffies_to_st(j) + NS_PER_TICK/2;
        singleshot.flags = 0;
        rc = HYPERVISOR_vcpu_op(VCPUOP_set_singleshot_timer, cpu, &singleshot);
 #if CONFIG_XEN_COMPAT <= 0x030004

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